Hair-dye composition

ABSTRACT

A hair dye composition comprising the following components (A) and (B), in which the mass ratio of the component (B) to the component (A), (B)/(A), in a whole composition is 1 or more and 100 or less and the pH (25° C.) during application is 7.5 to 12:
         (A): one or more azo dyes selected from the group consisting of the following (A-1), (A-2) and (A-3)       

     
       
         
         
             
             
         
       
         
         
           
             (B): 2-amino-2-methylpropanol.

FIELD OF THE INVENTION

The present invention relates to a hair dye composition and a method fordyeing hair using the composition.

BACKGROUND OF THE INVENTION

Hair dye compositions are classified depending upon the types of dyes tobe used or the presence or absence of a melanin bleaching action.Typical examples of the hair dye compositions include a two-agent typeoxidative hair dye composition consisting of a first agent containing analkali agent, an oxidation dye and an optional direct dye such as anitro dye and a second agent containing an oxidizing agent; andone-agent type non-oxidative hair dye composition containing a pHadjuster (acid or alkali) and at least one of direct dye such as an aciddye, a basic dye and a nitro dye.

As the direct dye to be used in these hair dye compositions, adissociative azo dye is known which contains a dissociative proton in amolecule and displays a color by dissociation of the proton (forexample, Patent Document 1).

[Patent Document 1] JP-A-2003-342139

SUMMARY OF THE INVENTION

The present invention provides a hair dye composition comprising thefollowing components (A) and (B), in which the mass ratio of a component(B) to a component (A), (B)/(A), in a whole composition is 1 or more and100 or less and the pH (25° C.) during application is 7.5 to 12:

(A): one or more azo dyes selected from the group consisting of thefollowing (A-1), (A-2) and (A-3):

(B): 2-amino-2-methylpropanol.

The present invention further provides a method for dyeing hair byapplying the hair dye composition to the hair, allowing the compositionto stand for 1 to 60 minutes and washing away the composition.

DETAILED DESCRIPTION OF THE INVENTION

In hair dyes containing direct dyes, no matter which dosage form(mentioned above) the dyes have, it is difficult to determine a finalpoint of a rinsing process (which is performed at the end of a dyeingprocess) for washing away a composition on hair. Because of this, if thehair is dried without completing the rinsing process, a direct dye islikely to fall off from the hair. To be more specific, the direct dyeremaining on the surface of the hair sometimes falls off by perspirationduring exercise and sleep and stains cloths used in e.g., a cap and apillow. The color transfer more significantly occurs if the dyeabilityof a hair dye is improved.

The azo dye (dissociative azo dye) containing a dissociative proton(s)proposed in Patent Literature 1 dissociates a proton(s) in an alkalineenvironment and displays brilliant color; at the same time, the azo dyeinteracts with hair. For the reason, the dissociative azo dye issuitably used in a hair dye composition. However, for this reason thatthe dissociative azo dye displays more brilliant color than other directdyes, when a hair dye composition containing the dissociative azo dye isused, rinsing must be completely performed. If not, significant colortransfer tends to occur from the hair colored with the dissociative azodye to cloths. In addition to this problem, a dissociative azo dye has aproblem in that since the solubility of a dissociative azo dye to a hairdye composition is low, the dissociative azo dye frequentlyre-precipitates during production and storage and fails to dye the hairuniformly during application, due to the non-uniformity of the dye.

Thus, the present invention relates to a hair dye composition havinghigh hair-dyeability, suppressed in color transfer to cloths and furtherimproved in solubility of an azo dye to a hair dye composition.

The present inventors studied with a view to solving the aforementionedproblems by paying attention to an alkaline agent. As a result, theyfound that depending upon the type of alkaline agent, in a predeterminedazo dye, not only hair-dyeability and suppression of color transfer tocloths vary but also solubility changes. They further found that a hairdye composition containing 2-amino-2-methylpropanol as an alkaline agentin a predetermined ratio relative to an azo dye has highhair-dyeability, highly dissolves the azo dye during production, andcolor transfer to cloths after hair-dye treatment, can be suppressed.Based on the findings, the present invention was accomplished.

<Component (A): Azo Dyes>

The hair dye composition of the present invention contains one or moreazo dyes selected from the group consisting of the following (A-1),(A-2) and (A-3), as a component (A).

Note that, the pKa values of the azo dyes (A-1), (A-2) and (A-3) are6.0, 6.0 and 7.5, respectively. Thus, in the hair dye composition of thepresent invention having pH (25° C.) of 7.5 to 12, almost 80% or more ofthese azo dyes are present in an anionic state where a proton(s) isdissociated. When a proton(s) dissociates, (A-1) displays red, (A-2)blue and (A-3) yellow.

The total content of the azo dye in a whole composition is, in order toincrease hair-dyeability, suppress color transfer to e.g., cloths, andfurther improve solubility to a hair dye composition, preferably 0.01mass % or more, more preferably 0.03 mass % or more, further preferably0.05 mass % or more, further preferably 0.08 mass % or more and furtherpreferably 0.1 mass % or more; and preferably 5 mass % or less, morepreferably 3 mass % or less, further preferably 2.5 mass % or less,further preferably 1.5 mass % or less, further preferably 1 mass % orless and further preferably 0.5 mass % or less. Note that the hair dyecomposition of the present invention can use a dye other than the azodyes (A-1), (A-2) and (A-3), in combination. However, in order not toaffect dyeability of a component (A), it is preferable that the totalcontent of the azo dyes (A-1), (A-2) and (A-3) is 1 mass % or more and100 mass % or less of in all the dyes, further 5 mass % or more and 100mass % or less, further 10 mass % or more and 100 mass % or less andfurther 20 mass % or more and 100 mass % or less.

If a hair dye composition is a two-agent type or three-agent typecomposition, an azo dye as mentioned above may be contained in any oneof a first agent, a second agent and a third agent. In view of thestability of the composition, the azo dye is preferably contained in afirst agent or a third agent and more preferably contained in a firstagent.

<Oxidation Dye>

In the case where the hair dye composition of the present invention is atwo-agent type or three-agent type-agent type compositions, not only theazo dyes but also an oxidation dye can be added in the first agent. As apreferable oxidation dye for the hair dye composition of the presentinvention, a precursor and a coupler known in the art and used inconventional hair dyes can be used.

Examples of the precursor include para-phenylenediamine,toluene-2,5-diamine, 2-chloroparaphenylenediamine, para-aminophenol,para-methylaminophenol, ortho-aminophenol, 2,4-diaminophenol,N-phenyl-para-phenylenediamine and salts of these.

Examples of the coupler include meta-phenylenediamine,2,4-diaminophenoxyethanol, meta-aminophenol, 2-methyl-5-aminophenol,2-methyl-5-(2-hydroxyethylamino)phenol, resorcin, 1-naphthol,1,5-dihydroxynaphthalene, hydroquinone and salts of these.

The precursors and couplers are individually used singly or incombination of two or more. The total content thereof in a wholecomposition is preferably set as long as the dyeability of the azo dyesis not affected. The total content is preferably 0.01 mass % or more andmore preferably 0.1 mass % or more; and preferably 5 mass % or less,more preferably 3 mass %, further preferably 2 mass % or less, furtherpreferably 1 mass % or less and further preferably 0.5 mass % or less.

<Direct Dye Other than Component (A)>

In the hair dye composition of the present invention, a direct dye otherthan the azo dyes (A-1), (A-2) and (A-3) can be further contained. Inthe case where the hair dye composition of the present invention is atwo-agent type or three-agent type composition, a direct dye except azodyes (A-1) (A-2) and (A-3) is preferably contained in a first agent. Asthe direct dye, an acid dye, a basic dye and a dispersive dye known inthe art and available in hair dyes can be used.

Examples of the acid dye include Blue No. 1, Purple No. 401, Black No.401, Orange No. 205, Red No. 227, Red No. 106, Yellow No. 203 and AcidicOrange 3. Examples of the basic dye include Basic Blue 99, Basic Blown16, Basic Blown 17, Basic Red 76 and Basic yellow 57.

Examples of the direct dye other than the acid dyes and basic dyesinclude 2-nitro-p-phenylenediamine, 2-amino-6-chloro-4-nitrophenol,3-nitro-p-hydroxyethylaminophenol, 4-nitro-o-phenylenediamine,4-amino-3-nitrophenol, 4-hydroxypropylamino-3-nitrophenol,N,N-bis(2-hydroxyethyl)-2-nitro-p-phenylenediamine, dispersive Purple 1,dispersive Blue 1, dispersive Black 9, HC Blue 2, HC Orange 1, HC Red 1,HC Red 3, HC Yellow 2, HC Yellow 4 and HC Yellow 5.

These direct dyes other than the azo dyes (A-1), (A-2) and (A-3) can beused singly or in combination of two or more. The content thereof in awhole composition is preferably 0.001 mass % or more and more preferably0.01 mass % or more; and preferably 5 mass % or less, more preferably 3mass % or less, further preferably 2 mass % or less, further preferably1 mass % or less and further preferably 0.5 mass % or less.

<Component (B): 2-amino-2-methylpropanol>

The hair dye composition of the present invention contains an alkalineagent, i.e., 2-amino-2-methylpropanol, as a component (B).

The total content of a component (B) in a whole composition is, in orderto increase hair-dyeability, suppress color transfer to e.g., cloths,and further improve solubility of a component (A) to a hair dyecomposition, preferably 0.01 mass % or more, more preferably 0.05 mass %or more, further preferably 0.1 mass % or more and further preferably0.3 mass % or more; and preferably 10 mass % or less, more preferably 9mass % or less, further preferably 8 mass % or less, further preferably6 mass % or less and further preferably 4 mass % or less.

A component (B) may be contained in either a first agent or a thirdagent when a hair dye composition is a two-agent type or three-agenttype composition; however, in view of stability of a composition, acomponent (B) is preferably contained in a first agent.

The mass ratio of a component (B) to a component (A), (B)/(A), in awhole composition is, in order to increase hair-dyeability, suppresscolor transfer to e.g., cloths, and improve solubility of a component(A) to a hair dye composition, 1 or more, preferably 2 or more, morepreferably 3 or more and further preferably 5 or more; and 100 or less,preferably 90 or less, more preferably 80 or less, further preferably 60or less and further preferably 50 or less.

<pH>

The pH (25° C.) of the hair dye composition of the present inventionduring application is, in the case of a one-agent type hair dyecomposition, preferably 8 or more, more preferably 8.5 or more andfurther preferably 9 or more; and preferably 11.5 or less, morepreferably further 11 or less and further preferably 10.5 or less.

In the case where the hair dye composition of the present invention is atwo-agent type or three-agent type composition, the pH (25° C.) of afirst agent is preferably 8 to 12 and the pH (25° C.) of a second agentis preferably 2 to 5. The pH (25° C.) of a mixture of first to thirdagents is, in view of hair dyeing effect and skin irritation, preferably8 or more, more preferably 8.5 or more and further preferably 9 or more;and preferably 11.5 or less, more preferably 11 or less and furtherpreferably 10.5 or less.

Note that, in the specification, the pH of a hair dye composition is avalue measured at room temperature (25° C.) by a pH meter F-22manufactured by Horiba, Ltd.

<Alkaline Agent Except Component (B)>

To the hair dye composition of the present invention, an alkaline agentother than 2-amino-2-methylpropanol serving as a component (B) can befurther contained. If the hair dye composition of the present inventionis a two-agent type or three-agent type composition, the alkaline agentis contained in a first agent. Examples of such an alkaline agentinclude ammonia and a salt thereof, sodium hydroxide, potassiumhydroxide, an alkanolamine such as monoethanolamine, isopropanolamineand 2-aminobutanol, and a salt thereof; an alkanediamine such as1,3-propanediamine, and a salt thereof; and a carbonate such as sodiumcarbonate, potassium carbonate, sodium hydrogen carbonate, potassiumhydrogen carbonate and guanidine carbonate. Of these alkaline agents, atleast one member selected from the group consisting of ammonia and asalt thereof and monoethanolamine and a salt thereof is preferable.

The alkaline agents except a component (B) may be used in combinationwith two or more and a content thereof in a whole composition, is, inorder to produce a sufficient hair dyeing effect, preferably 0.01 mass %or more, further 0.05 mass % or more, further 0.1 mass % or more,further 0.2 mass %, or more, further 0.5 mass % or more and further 1mass % or more; and in order to reduce hair damage and scalp irritation,preferably 20 mass % or less, further 10 mass % or less, further 5 mass% or less, further 4 mass % or less and further preferably 3 mass % orless.

<Surfactant>

To the hair dye composition of the present invention, a surfactant canbe contained. Examples of the surfactant include a cationic surfactant,a nonionic surfactant, an amphoteric surfactant and an anionicsurfactant. Of these, in view of stability of a composition, an anionicsurfactant and a nonionic surfactant are preferable.

Examples of the anionic surfactant include an alkylbenzene sulfonatesalt, an alkyl or alkenyl ether sulfate salt, an alkyl or alkenylsulfate salt, an olefin sulfonate salt, an alkane sulfonate salt, asaturated or unsaturated fatty acid salt, an alkyl or alkenyl ethercarboxylate salt, an a-sulfo fatty acid salt, a N-acylamino acid salt, aphosphoric acid mono- or diester and a sulfosuccinic acid ester.Examples of the alkyl ether sulfate salt include polyoxyethylene alkylether sulfate salt. Of them, an alkyl sulfate salt, an alkyl ethersulfate salt, a saturated fatty acid salt and an alkyl ether carboxylatesalt are preferable. Examples of the counter ions to the anionic groupsof these anionic surfactants include alkali metal ions such as a sodiumion and a potassium ion; alkaline earth metal ions such as a calcium ionand a magnesium ion; an ammonium ion; and an alkanolamine salt having 1to 3 alkanol groups having 2 or 3 carbon atoms (for example,monoethanolamine salt, diethanolamine salt, triethanolamine salt,triisopropanolamine salt).

As the cationic surfactant, in order to provide an excellent feel to thehair after hair dyeing, a monoalkyl trimethyl ammonium chloride, adialkyl dimethyl ammonium chloride and monoalkyl trimethyl ammoniumbromide are preferable. Of them, stearyl trimethyl ammonium chloride(steartrimonium chloride), cetyl trimethyl ammonium chloride(cetrimonium chloride), lauryl trimethyl ammonium chloride (lauryltrimonium chloride) are more preferable. These are preferably used as amixture of two or more.

Examples of the nonionic surfactant include a polyoxyalkylene alkylether, a polyoxyalkylene alkenyl ether, a higher fatty acid sucroseester, a polyglycerin fatty acid ester, a higher fatty acid mono- ordi-ethanolamide, a polyoxyethylene hardened castor oil, apolyoxyethylene sorbitan fatty acid ester, a polyoxyethylene sorbitanfatty acid ester, an alkyl saccharide, an alkylamine oxide and analkylamidoamine oxide. Of them, a polyoxyalkylene alkyl ether, apolyoxyethylene hardened castor oil and an alkyl saccharide arepreferable, a polyoxyethylene alkyl (12 to 14) ether and an alkylpolyglucoside are more preferable.

Examples of the amphoteric surfactant include imidazoline, carbobetaine,amidobetaine, sulfobetaine, hydroxysulfobetaine and amidosulfobetaine. Abetaine surfactant such as an alkyl dimethylaminoacetic acid betaine anda fatty acid amidopropylbetaine is more preferable and a fatty acidamidopropylbetaine is further preferable.

In the case where a hair dye composition is a two-agent type orthree-agent type composition, a surfactant may be contained in any oneof a first agent, a second agent and a third agent.

These surfactants can be used singly or in combination of two or more.The content thereof in a whole composition is, in order to obtainsatisfactory texture and emulsification performance, preferably 0.01mass %, more preferably 0.1 mass % or more, further preferably 0.2 mass% or more, and further preferably 0.3 mass % or more; and preferably 30mass % or less, more preferably 25 mass % or less, further preferably 20mass % or less, further preferably 10 mass % or less, further preferably5 mass % or less, further preferably 3 mass % or less and furtherpreferably 1.5 mass % or less.

<Cationic Polymer>

To the hair dye composition of the present invention, a cationic polymercan be contained. Examples of the cationic polymer include dimethyldiallyl ammonium salt-based copolymers such as a dimethyl diallylammonium chloride/acrylic acid copolymer, a dimethyl diallyl ammoniumchloride/acrylamide copolymer and a dimethyl diallyl ammoniumchloride/acrylamide/acrylic acid copolymer. Of them, a polymercontaining a diallyl quaternary ammonium salt as a building block ispreferably contained.

The polymer containing a diallyl quaternary ammonium salt as a buildingblock is a polymer having a skeleton represented by the followingformula (1) or (2).

In the formula, R¹ and R² may be the same or different, each represent ahydrogen atom, or an alkyl group, an aryl group (e.g., phenyl group), ahydroxyalkyl group, an amidoalkyl group, a cyanoalkyl group, analkoxyalkyl group or a carboalkoxyalkyl group having 1 to 18 carbonatoms; R³ and R⁴ may be the same or different, each represent a hydrogenatom, an alkyl group having 1 to 3 carbon atoms or a phenyl group; andX⁻ represents an anion (e.g., a chloride ion, a bromide ion, an iodideion, a sulfate anion, sulfonate anion, a methyl sulfate anion, aphosphate anion, a nitrate anion).

The polymer containing a diallyl quaternary ammonium salt as a buildingblock, in order to improve hair gloss, manageability and fingercombability, contains preferably 85 to 100 mol %, more preferably 90 to100 mol % and further preferably 95 to 100 mol % of a building blockrepresented by the formula (4) or (5) in a molecule.

As the polymer containing a diallyl quaternary ammonium salt as abuilding block, a homo polymer of a diallyl quaternary ammonium salt anda diallyl quaternary ammonium salt/acrylic acid copolymer arepreferable. Specific examples of the homo polymer of a diallylquaternary ammonium salt include Merquat 100 (manufactured by LubrizolAdvanced Materials, Inc., charge density: 6.2 meq/g, weight-averagemolecular weight: 150,000). Specific examples of the diallyl quaternaryammonium salt/acrylic acid copolymer include Merquat 295 (manufacturedby Lubrizol Advanced Materials, Inc., charge density: 6.0 meq/g,weight-average molecular weight: 190,000) and Merquat 280 (manufacturedby Lubrizol Advanced Materials, Inc., charge density: 5.0 meq/g,weight-average molecular weight: 450,000).

As a polymer substance of a diallyl quaternary ammonium salt and acrylicacid, for example, a polymer represented by the following formula (3) or(4) is preferable.

In each of the formulas, R¹, R², R³, R⁴ and X⁻ are the same as definedabove; x and y each represent an integer of 1 to 100; and z representsan integer of 150 to 8,000.

The ratio of x to y (x:y) is preferably 80:20, more preferably 90:10 andfurther preferably 95:5.

The weight-average molecular weight of a cationic polymer is, in orderfor the polymer to attach hair and rarely remove during hair-washing andrinsing; at the same time, to stabilize foams, preferably 10,000 ormore, more preferably 50,000 or more and further preferably 100,000 ormore; and in view of the satisfactory ejectability of foams, preferably3,000,000 or less, more preferably 1,000,000 or less and furtherpreferably 200,000 or less.

The weight-average molecular weight herein can be measured, for example,by gel permeation chromatography (GPC) in the following conditions.

Mobile phase: 50 mM LiBr, 1% CH₃COOH/ethanol:water=3:7

Column: TSK gel α-M (two columns arranged in tandem)

Internal Standard: Polyethylene glycol

The charge density of a cationic polymer is, in order to improvehair-gloss, manageability and finger combability, preferably 5.0 meq/gor more, more preferably 5.5 meq/g or more and further preferably 6.1meq/g or more; and, in view of stability of a composition, preferably6.5 meq/g or less. Herein, the charge density of a cationic polymerrefers to the mole number of cationic groups per polymer (1 g)×1000(meq/g).

The content of a cationic polymer in a mixture is, in view ofmaintenance of effect, preferably 0.01 mass % or more, more preferably0.05 mass % or more and further preferably 0.1 mass % or more; andpreferably 5 mass % or less, more preferably 3 mass % or less, furtherpreferably 1 mass % or less and further preferably 0.8 mass % or less.The cationic polymer may be contained in any one of a first agent, asecond agent and a third agent in the case where a hair dye compositionis a two-agent type or three-agent type composition.

<pH Adjuster>

The hair dye composition of the present invention can employ a pHadjuster such as an inorganic acid such as hydrochloric acid andphosphoric acid; an organic acid such as citric acid, glycolic acid,malic acid and lactic acid; a hydrochloride such as monoethanolaminehydrochloride; and a phosphate such as potassium dihydrogen phosphateand disodium hydrogen phosphate.

These pH adjusters may be contained in any one of a first agent, asecond agent and a third agent in the case of a two-agent type orthree-agent type hair dye. Furthermore, the content of a pH adjuster ina whole composition is, in order to produce a sufficient dyeing effectand reduce hair damage and scalp irritation, preferably 0.05 mass % ormore, more preferably 0.1 mass % or more and further preferably 0.2 mass% or more; and preferably 15 mass % or less, more preferably 10 mass %or less, further preferably 5 mass % or less and further preferably 3mass % or less.

<Hydrogen Peroxide>

In the case where the hair dye composition of the present invention is atwo-agent type hair dye or three-agent type hair dye, hydrogen peroxidecan be contained in a second agent. The content of hydrogen peroxide ina whole composition is, in order to produce a sufficient hair dyeingeffect, preferably 0.1 mass % or more, further 0.5 mass % or more andfurther 1 mass % or more; and in order to reduce hair damage and scalpirritation, preferably 12 mass % or less, further 9 mass % or less,further 6 mass % or less and further preferably 4 mass % or less.

<Higher Alcohol>

To the hair dye composition of the present invention, a higher alcoholhaving 12 or more carbon atoms is preferably contained in order toimprove texture and stability. The higher alcohol may be contained inany one of a first agent, a second agent and a third agent in the casewhere the hair dye composition of the present invention is a two-agenttype or three-agent type composition.

As the higher alcohol, higher alcohols having 12 or more and further 16or more carbon atoms; and 30 or less and further 22 or less carbon atomsare preferable. Specific examples thereof include myristyl alcohol,cetyl alcohol, stearyl alcohol, arachyl alcohol, behenyl alcohol,isostearyl alcohol, 2-octyldodecanol and oleyl alcohol.

The higher alcohols may be used in combination with two or more. Thecontent thereof in a whole composition is, in view of viscosity andstability of a hair dye composition, preferably 3 mass % or more andfurther 4 mass % or more; and preferably 11 mass % or less and further 9mass % or less.

<Organic Solvent>

The hair dye composition of the present invention may contain an organicsolvent. Examples of the organic solvent include lower alkanols such asethanol, 1-propanol and 2-propanol; aromatic alcohols such as benzylalcohol, 2-benzyloxy ethanol and phenoxyethanol; polyols such aspropylene glycol, 1,3-butanediol, diethylene glycol and glycerin; etheralcohols such as ethoxy ethanol, ethoxy diglycol and methoxy ethanol;N-alkyl pyrrolidones such as N-methylpyrrolidone and N-ethylpyrrolidone; alkylene carbonates such as propylene carbonate; andlactones such as γ-valerolactone and γ-caprolactone.

These organic solvents can be used singly or in combination of two ormore. The content thereof in a whole composition is preferably 0.1 mass% or more, more preferably 0.5 mass % or more and further preferably 1mass % or more; and preferably 30 mass % or less, more preferably 20mass % or less, further preferably 10 mass % or less and furtherpreferably 5 mass % or less.

<Water-Soluble Polymer>

In the hair dye composition of the present invention, a water-solublepolymer can be contained in order to prevent dripping during applicationand deposition of dirt on e.g., the scalp. Note that, in thespecification, the cationic polymer as mentioned above is not containedin the water-soluble polymer. Examples of the water-soluble polymerinclude gum Arabic, carrageenan, karaya gum, tragacanth gum, carob gum,quince seed (quince), casein, dextrin, gelatin, sodium pectate, sodiumalginate, methylcellulose, ethylcellulose, carboxymethylcellulose (CMC),hydroxyethylcellulose, hydroxypropylcellulose, polyvinyl alcohol (PVA),polyvinyl methyl ether (PVM), polyvinylpyrrolidone (PVP), sodiumpolyacrylate, locust bean gum, guar gum, tamarind gum, dialkyl dimethylammonium cellulose sulfate, xanthan gum, modified xanthan gum, welangum, Rhaball gum, gellan gum, a carboxyvinyl polymer, anacrylate-methacrylate copolymer, a methyl vinyl ether-maleic anhydridecopolymer partially crosslinked with 1,9-decadiene, polyethylene glycol,magnesium aluminum silicate and bentonite. Of them,hydroxyethylcellulose, xanthan gum and modified xanthan gum arepreferable.

These water-soluble polymers can be used singly or in combination of twoor more. The content thereof in a whole composition is preferably 0.1mass % or more and more preferably 0.5 mass % or more; and preferably 10mass % or less and more preferably 5 mass % or less.

<Conditioning Component>

The hair dye composition of the present invention can contain aconditioning component suitable for applying to the hair. Theconditioning component is a polymer or oil soluble or dispersible in ahair dye composition and deposits onto the hair when a hair dyecomposition is washed away or diluted with water and shampoo.

Example of the conditioning component suitable for use in the hair dyecomposition of the present invention include silicones (for example,silicone oil, cationic silicone, silicone gum, silicone resin), organicconditioning oils (for example, a hydrocarbon oil, a polyolefin, a fattyacid ester), aliphatic amides and polyalkylene glycols.

These conditioning components can be used singly or in combination oftwo or more. The content thereof in a whole composition is preferably0.01 mass % or more, more preferably 0.05 mass % or more and furtherpreferably 0.5 mass % or more; and preferably 20 mass % or less, morepreferably 15 mass % or less and further preferably 5 mass % or less.

<Medium>

In the hair dye composition of the present invention, water is used as amedium. It is preferable that the content of water in a hair dyecomposition is 10 mass % or more, further 20 mass % or more, further 30mass % or more and further 40 mass % or more and further 50 mass % ormore; and 95 mass % or less, further 90 mass % or less and further 85mass % or less.

<Other Optional Components>

In the hair dye composition of the present invention, other componentsused as normal cosmetic raw materials can be added other than theaforementioned components.

Such optional components can be added for the blending purpose ofpearling, preservation, sequestering, stabilization, anti-oxidation,ultraviolet absorption, moisturization, product coloring and perfuming.Examples of the specific optional components include animal andvegetable fats and oils, higher fatty acids, protein hydrolysates,protein derivatives, amino acids, plant extracts, vitamins, dyes andfragrances.

<Dosage Form>

The hair dye composition of the present invention can be used asone-agent type, two-agent type, or three-agent type hair dye. Theone-agent type hair dye composition consists of a single agentcontaining components (A) and (B). The two-agent type hair dyecomposition preferably consists of a first agent containing a component(A) and an alkali agent and a second agent containing hydrogen peroxide.The three-agent type hair dye composition preferably consists of a firstagent containing an alkali agent, a second agent containing hydrogenperoxide and a third agent containing the component (A); or consists ofa first agent containing a component (A) and an alkali agent, a secondagent containing hydrogen peroxide and a third agent containing othercomponents. As the third agent containing the other components, apowdery oxidizing agent formed of granules of a persulfate (e.g.,ammonium persulfate, potassium persulfate, sodium persulfate) ispreferably used for improving bleaching power.

Note that, in the present invention, “the whole composition” refers theentire composition to be applied to the hair-dye treatment. In the caseof the two-agent type hair dye, a mixture prepared by mixing a firstagent and a second agent is referred to and in the three-agent type hairdye, a mixture of a first agent, a second agent and a third agent isreferred to.

The hair dye composition of the present invention can be used, forexample, in the form of liquid, emulsion, cream, gel, paste and mousseand prepared in the form of aerosol. In these cases, it is desirable tocontrol the viscosity of the whole composition so as to rarely drip outwhen the composition is applied to the hair. The viscosity of the wholecomposition (25° C.) is preferably 2,000 to 200,000 mPa·s, morepreferably 4,000 to 150,000 mPa·s, further preferably 6,000 to 100,000mPa·s and further preferably 8,000 to 80,000 mPa·s, as a measurementvalue obtained by a type-B rotational viscometer with a helical stand(model; digital viscometer TVB-10, Toki Sangyo Co., Ltd.) after thecomposition is rotated by use of rotor T-C at 10 rpm for one minute.Note that, in the case of a two-agent type or three-agent typecomposition, it is specified that the viscosity of the composition isdetermined 3 minutes after blending individual agents.

The hair dye composition of the present invention can be used in a formof foam by ejecting from a non-aerosol type foamer or shaking in a cupupon application to the hair. In this case, it is desirable to controlthe viscosity of the whole composition before foamed so as to avoiddripping when the composition is foamed and applied to the hair. Theviscosity of the whole composition (25° C.) is preferably 1 to 800mPa·s, more preferably 1 to 600 mPa·s, further preferably 1 to 500mPa·s, further preferably 1 to 300 mPa·s as a measurement value measuredby a type-B rotating viscometer (model; digital viscometer TV-10, TokiSangyo Co., Ltd.) after the composition is rotated by use of rotor No. 1at 30 rpm for one minute (note that when the viscosity excesses 160mPa·s, a measurement value obtained after the composition is rotated at12 rpm for one minute). Note that, in the case of a two-agent type orthree-agent type composition, the viscosity of the composition isdetermined 3 minutes after blending individual agents.

<Method for Dyeing Hair>

Hair-dye treatment using the hair dye composition of the presentinvention may be performed, for example, by applying the hair dyecomposition of the present invention (after first to third agents aremixed right before use in the case of a two-agent type or three-agenttype composition), allowing to stand in a predetermined time, washingaway the composition with water, and drying the hair. The hair dyecomposition of the present invention is applied to the hair at anapplication temperature of 15 to 45° C. preferably for 1 to 60 minutes,further preferably 5 to 45 minutes and further preferably 10 to 30minutes.

With respect to the aforementioned embodiment, preferable embodiments ofthe present invention will be further disclosed below.

<1> A hair dye composition comprising the following components (A) and(B), in which the mass ratio of a component (B) to a component (A),(B)/(A), in a whole composition is 1 or more and 100 or less and the pH(25° C.) during application is 7.5 to 12:

(A): one or more azo dyes selected from the group consisting of thefollowing (A-1), (A-2) and (A-3):

(B): 2-amino-2-methylpropanol.

<2> The hair dye composition according to <1>, in which the content ofthe component (A) in the whole composition is preferably 0.01 mass % ormore, more preferably 0.03 mass % or more, further preferably 0.05 mass% or more, further preferably 0.08 mass % or more and further preferably0.1 mass % or more; and preferably 5 mass % or less, more preferably 3mass % or less, further preferably 2.5 mass % or less, furtherpreferably 1.5 mass % or less, further preferably 1 mass % or less andfurther preferably 0.5 mass % or less.

<3> The hair dye composition according to <1> or <2>, in which thecontent of the component (B) in the whole composition is preferably 0.01mass % or more, more preferably 0.05 mass % or more, further preferably0.1 mass % or more and further preferably 0.3 mass % or more; andpreferably 10 mass % or less, more preferably 9 mass % or less, furtherpreferably 8 mass % or less, further preferably 6 mass % or less andfurther preferably 4 mass % or less.

<4> The hair dye composition according to any one of <1> to <3>, inwhich the mass ratio of the component (B) to the component (A), (B)/(A),in the whole composition is preferably 2 or more, more preferably 3 ormore and further preferably 5 or more; and preferably 90 or less, morepreferably 80 or less, further preferably 60 or less, and furtherpreferably 50 or less.

<5> The hair dye composition according to any one of <1> to <4>,preferably further comprising a surfactant.

<6> The hair dye composition according to <5>, in which the surfactantis preferably at least one member selected from the group consisting ofan anionic surfactant, a cationic surfactant, a nonionic surfactant, andan amphoteric surfactant.

<7> The hair dye composition according to <5> or <6>, in which thecontent of the surfactant in the whole composition is preferably 0.01mass %, more preferably 0.1 mass % or more, further preferably 0.2 mass%, or more and further preferably 0.3 mass % or more; and preferably 30mass % or less, more preferably 25 mass % or less, further preferably 20mass % or less, further preferably 10 mass % or less, further preferably5 mass % or less, further preferably 3 mass % or less and furtherpreferably 1.5 mass % or less.

<8> The hair dye composition according to <6> or <7>, in which theanionic surfactant is one or more member selected from the groupconsisting of an alkyl sulfate salt, an alkyl ether sulfate salt, asaturated fatty acid salt and an alkyl ether carboxylate salt.

<9> The hair dye composition according to any one of <1> to <8>,preferably further comprising a cationic polymer.

<10> The hair dye composition according to <9>, in which the cationicpolymer is a polymer preferably containing a diallyl quaternary ammoniumsalt as a building block.

<11> The hair dye composition according to <9> or <10>, in which theweight-average molecular weight of the cationic polymer is preferably10,000 or more, more preferably 50,000 or more and further preferably100,000 or more; and preferably 3,000,000 or less, more preferably1,000,000 or less and further preferably 200,000 or less.

<12> The hair dye composition according to any one of <9> to <11>, inwhich the content of the cationic polymer in the whole composition ispreferably 0.01 mass % or more, more preferably 0.05 mass % or more andfurther preferably 0.1 mass % or more; and preferably 5 mass % or less,more preferably 3 mass % or less, further preferably 1 mass % or lessand further preferably 0.8 mass % or less.

<13> The hair dye composition according to any one of <1> to <12>,preferably further comprising a higher alcohol having 12 or more carbonatoms.

<14> The hair dye composition according to <13>, in which the higheralcohol preferably has 16 or more carbon atoms; and preferably 30 orless carbon atoms and more preferably 22 or less carbon atoms.

<15> The hair dye composition according to <13> or <14>, in which thecontent of the higher alcohol is preferably 3 mass % or more and morepreferably 4 mass % or more; and preferably 11 mass % or less and morepreferably 9 mass % or less.

<16> The hair dye composition according to any one of <1> to <15>, inwhich the pH (25° C.) during application is preferably 8 or more, morepreferably 8.5 or more and further preferably 9 or more; and preferably11.5 or less, more preferably further 11 or less and further preferably10.5 or less.

<17> A method for dyeing hair comprising applying the hair dyecomposition according to any one of <1> to <16> to hair, allowing thecomposition to stand for 1 to 60 minutes and washing away thecomposition.

<18> Use of the hair dye composition according to any one of <1> to <16>for dyeing hair.

EXAMPLES Examples 1 to 8 and Comparative Examples 1 to 4

Hair dye compositions (one-agent type hair dye) having the compositionsshown in Tables 3 and 4 were prepared by the following method. Theobtained hair dye compositions were evaluated for dyeability, color ofrinse water and dye solubility by the following methods. The results ofthese are all together shown in Tables 3 and 4.

<Method for Preparing Hair Dye Composition>

(Examples and Comparative Examples except Examples 6 and 8) In water, anazo dye (A-1) serving as a component (A) and 2-amino-2-methylpropanolserving as component (B) or ammonia were added. The mixture was stirredfor a predetermined time to obtain a hair dye composition.

(Example 6) In water, an azo dye (A-1) serving as a component (A) and2-amino-2-methylpropanol serving as a component (B) were added.Thereafter, the pH of the resultant mixture was adjusted to 10.2 withhydrochloric acid and the mixture was stirred for a predetermined timeto obtain a hair dye composition.

(Example 8) In water, azo dye (A-1) serving as a component (A),2-amino-2-methylpropanol serving as a component (B) andpolyquaternium-22 were added. The mixture was stirred for apredetermined time to obtain a hair dye composition.

<Dyeability>

The hair dye composition was applied to a hair tress of goat hair (1 g)in a bath ratio (composition:goat hair)=1:1 (mass ratio), allowed tostand at 40° C. for 20 minutes, rinsed with water of about 40° C.,washed with the shampoo shown in Table 1, and washed with water. Then,the hair conditioner shown in Table 2 was applied to the hair tress andrinsed with water of about 40° C. The resultant hair was wiped withtowel and blow-dried.

The color of the obtained hair tress immediately after hair dyeing wasmeasured by a color-difference meter (colorimeter CR-400, manufacturedby Konica Minolta Sensing, Inc.) based on the CIE color system (L*, a*,b*). The difference from the color before dyeing was obtained inaccordance the following expression and used as dyeability ΔE*. Thelarger ΔE* means that the dyeability is more excellent.

ΔE*=√{square root over ((L ₁ ^(*) −L ₀ ^(*))²+(a ₁ ^(*) −a ₀ ^(*))²+(b ₁^(*) −b ₀ ^(*))²)}

In the formula, L^(*) ₀, a^(*) ₀ and b^(*) ₀ represent L*, a* and b*values of a hair tress before dyeing, respectively, and L^(*) ₁, a^(*) ₁and b^(*) ₁ are L*, a* and b* values of the hair tress immediately afterdyeing, respectively.

<Color of Rinse Water>

A hair dye composition was applied to a hair tress of goat hair (1 g) ina bath ratio (composition:goat hair)=1:1 (mass ratio), allowed to standat 40° C. for 20 minutes, rinsed with water of about 40° C., washed withthe shampoo shown in Table 1 and rinsed. Then, the hair conditionershown in Table 2 was applied and rinsed with water of about 40° C. Theresultant hair was wiped with towel and blow-dried.

The resultant goat hair was soaked in ion exchange water (100 g) andshaken by use of a constant-temperature shaking water vessel (UNI THERMOSHAKER NTS-1300, manufactured by Tokyo Rikakikai Co., Ltd.) at 40° C.for 2 minutes at 100 rpm. This step was repeated four times. Theabsorbance (521 nm) of the solution (fourth time) was measured by use ofa two-side transparent semi-microdispo cell (cell length: 1 cm)(manufactured by Nikko Hansen & Co., Ltd.) and a ultraviolet-visiblespectrophotometer (V-560, manufactured by JASCO Corporation). In thismanner, the color of rinse water was determined. The lower absorbance(521 nm) of rinse water means that color is less transferred from thehair dye on the goat hair.

TABLE 1 Active amount Formulation of shampoo (pH 7) (mass %) Disodiumedetate 0.3 Sodium benzoate 0.5 Lauramide DEA (diethanolamide)*¹ 1.5Sodium laureth sulfate*² 15.5 Phosphoric acid q.s. Water Balance Total100 *¹Aminon L-02, manufactured by Kao Corp. *²EMAL 227-pH11 (W),manufactured by Kao Corp.

TABLE 2 Active amount Hair conditioner formulation (pH 7) (mass %)Methylparaben 0.1 Cetearyl alcohol 2.0 Propylene glycol 5.0 Distearyldimonium chloride*¹ 2.7 Steartrimonium chloride*² 0.8 Water BalanceTotal 100 *¹QUARTAMIN D86P, manufactured by Kao Corp. *²QUARTAMIN 86W,manufactured by Kao Corp.

<Dye Solubility>

The dye solubility of hair dye compositions was visually evaluated basedon the criteria shown below after preparation of the hair dyecompositions.

3: Dye is easily dissolved and no precipitates are present

2: No precipitates are present; however, time is required until a dye isdissolved

1: Precipitates are present

TABLE 3 Example Comparative Example Active amount (mass %) 1 2 3 4 5 6 12 3 4 (A) Azo dye (A-1) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 (B)2-Amino-2-methylpropanol 0.1 0.5 2 5 10 5 0.01 12 20 — Ammonia — — — — —— — — — 1.76 Hydrochloric acid — — — — — q.s. — — — — Water BalanceBalance Balance Balance Balance Balance Balance Balance Balance BalanceTotal 100 100 100 100 100 100 100 100 100 100 pH (25° C.) 10.05 10.711.3 11.54 11.77 10.2 9 11.8 11.98 11.46 (B)/(A) 1 5 20 50 100 50 0.1120 200 0 Evaluation Dyeability (ΔE) 68.4 68.0 67.0 65.8 65.0 65.6 *62.4 60.9 67.2 Color of rinse water 0.099 0.098 0.094 0.090 0.0920.092 * 0.090 0.083 0.137 (absorbance at 521 nm) Dye solubility 2 3 3 33 3 1 3 2 2 * Evaluation was not made since the azo dye exhibited poorsolubility to hair dye composition and remained undissolved

TABLE 4 Example Active amount (mass %) 7 8 (A) Azo dye (A-1) 0.05 0.05(B) 2-Amino-2-methylpropanol 2 2 Polyquaternium-22 (*1) — 0.1 WaterBalance Balance Total 100 100 pH (25° C.) 11.08 11.14 (B)/(A) 40 40Evaluation Dyeability (ΔE) 63.3 62.8 Color of rinse water (absorbance at0.022 0.011 521 nm) Dye solubility 3 3 (*1): Merquat 280, manufacturedby Japan LUBRIZOL

Examples 9 to 12

A first agent of each of the hair dye compositions (two-agent type hairdye) having the composition shown in Table 5 was prepared by thefollowing method. Also, a second agent was prepared in accordance with aconventional method. A hair dye composition was prepared by mixing thefirst agent shown in Table 5 and the second agent in a ratio of 1:1(mass ratio) and evaluated for dyeability, color of rinse water and dyesolubility in the same manner as above. The evaluation results are alltogether shown in Table 5.

<Method for Preparing First Agent>

In water, a component (A), a component (B) and propylene glycol wereblended. The mixture was stirred at 60° C. for a predetermined time toprepare an Aqueous Solution 1. Subsequently, the dye solubility ofAqueous Solution 1 was checked. Separately, sodium laureth sulfate,cetearyl alcohol, myristyl alcohol, octyl dodecanol and oleyl alcoholwere dissolved at 60° C. to prepare Oil Phase 1. Then, Oil Phase 1 wasblended to Aqueous Solution 1. The mixture was stirred for apredetermined time and cooled to room temperature. To this,polyquaternium-22 was added and the mixture was stirred for apredetermined time to obtain a first agent.

TABLE 5 Example Active amount (mass %) 9 10 11 12 First agent (A) Azodye (A-1) 0.05 0.05 0.02 0.15 Azo dye (A-3) 0.1 — 0.08 0.3 Azo dye (A-2)0.05 0.05 — 0.15 (B) 2-Amino-2-methylpropanol 5 5 5 5 Sodium laurethsulfate (*1) 0.675 0.675 0.675 0.675 Cetearyl alcohol 5.6 5.6 5.6 5.6Myristyl alcohol 5.6 5.6 5.6 5.6 Octyldodecanol 1.6 1.6 1.6 1.6 Oleylalcohol 3.2 3.2 3.2 3.2 Propylene glycol 2.5 2.5 2.5 2.5Polyquaternium-22 (*2) 0.2 0.2 0.2 0.2 Water Balance Balance BalanceBalance Total 100 100 100 100 Second agent Sodium lauryl sulfate 0.190.19 0.19 0.19 Cetearyl alcohol 1.71 1.71 1.71 1.71 Glycerin 0.5 0.5 0.50.5 Hydrogen peroxide solution 5.7 5.7 5.7 5.7 Etidronic acid 0.0540.054 0.054 0.054 Salicylic acid 0.02 0.02 0.02 0.02 Disodium phosphate0.11 0.11 0.11 0.11 Phosphoric acid 0.24 0.24 0.24 0.24 Water BalanceBalance Balance Balance Total 100 100 100 100 pH (25° C.) 11.3 11.5 11.310.9 (B)/(A) 25 50 50 8.3 Evaluation Dyeability (ΔE) 52.1 47.6 46.3 59.3Color of rinse water 0.089 0.093 0.063 0.099 (absorbance at 521 nm) Dyesolubility of first agent 3 3 3 3 (*1): EMAL 227-pH11 (W), manufacturedby KAO Corporation (*2): Merquat 280, manufactured by Japan LUBRIZOL

1-11. (canceled) 12: A hair dye composition comprising the followingcomponents (A) and (B), wherein a mass ratio of a component (B) to acomponent (A), (B)/(A), in a whole composition is 1 or more and 100 orless and pH (25° C.) during application is 7.5 to 12: (A): one or moreazo dyes selected from the group consisting of the following (A-1),(A-2) and (A-3):

(B): 2-amino-2-methylpropanol. 13: The hair dye composition according toclaim 12, wherein a content of the component (A) in the wholecomposition is 0.01 mass % or more and 5 mass % or less. 14: The hairdye composition according to claim 12, wherein a content of thecomponent (B) in the whole composition is 0.01 mass % or more and 10mass % or less. 15: The hair dye composition according to claim 12,further comprising a surfactant. 16: The hair dye composition accordingto claim 15, wherein the surfactant is at least one member selected fromthe group consisting of an anionic surfactant, a cationic surfactant, anonionic surfactant and an amphoteric surfactant. 17: The hair dyecomposition according to claim 15, wherein a content of the surfactantin the whole composition is 0.01 mass % or more and 30 mass % or less.18: The hair dye composition according to claim 16, wherein the anionicsurfactant is one or more member selected from the group consisting ofan alkyl sulfate salt, an alkyl ether sulfate salt, a saturated fattyacid salt and an alkyl ether carboxylate salt. 19: The hair dyecomposition according to claim 12, further comprising a cationicpolymer. 20: The hair dye composition according to claim 19, wherein thecationic polymer is a polymer containing a diallyl quaternary ammoniumsalt as a building block. 21: The hair dye composition according toclaim 19, wherein a content of the cationic polymer in the wholecomposition is 0.01 mass % or more and 5 mass % or less. 22: The hairdye composition according to claim 12, further comprising a higheralcohol having 12 or more carbon atoms. 23: The hair dye compositionaccording to claim 22, wherein a content of the higher alcohol is 3 mass% or more and 11 mass % or less. 24: A method for dyeing hair,comprising: applying the hair dye composition according to claim 12 tothe hair, allowing the composition to stand for 1 to 60 minutes andwashing away the composition. 25: A hair dye composition comprising thefollowing components (A) and (B), wherein a mass ratio of a component(B) to a component (A), (B)/(A), in a whole composition is 5 or more and100 or less and pH (25° C.) during application is 7.5 to 12: (A): one ormore azo dyes selected from the group consisting of the following (A-1),(A-2) and (A-3):

(B): 2-amino-2-methylpropanol.